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Crystal and Molecular Structure of Anion Radical Salt (N-Me-DABCO)(TCNQ)2

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Abstract—

An anion radical salt of 7,7,8,8-tetracyanoquinodimethane (TCNQ) with the complex composition (N–Me–DABCO)(TCNQ)2 (1) has been synthesized. The crystal structure 1 has been characterized by X-ray diffraction. The structure of this salt consists of almost homogeneous stacks of TCNQ particles separated by cation layers. Interplanar spacings of 3.25 and 3.29 Å alternate in the stacks. Due to the alternating distances and uniform charge distribution in the stacks, conducting channels are formed in the structure, which determine the properties of an organic metal or a narrow-gap semiconductor, as confirmed by IR spectra containing electron-phonon interaction-related features. In particular, vibrational lines against the continuous absorption background are observed: the band gap does not exceed 0.06 eV. As a result lines of totally symmetric vibrations appear (without the electron-phonon interaction, these lines are forbidden in the IR spectra).

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Authors and Affiliations

  1. Institute of Chemistry, Jan Kochanowski University, 25-406, Kielce, Poland

    T. N. Starodub & W. Piotrowska

  2. Department of Organic Chemistry, School of Chemistry, Kharkiv National University, 61022, Kharkiv, Ukraine

    M. A. Kolosov

  3. Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany

    D. Fenske

  4. Institute of Nanotechnology and Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology, 76344, Eggenstein-Leopoldshafen, Germany

    D. Fenske & O. Fuhr

  5. Lehn Institute for Functional Materials, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, China

    D. Fenske & O. Fuhr

  6. NPO “Institute for Single Crystals,” National Academy of Sciences of Ukraine, 61001, Kharkiv, Ukraine

    S. V. Shishkina

Authors
  1. T. N. Starodub
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  2. M. A. Kolosov
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  3. D. Fenske
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Correspondence to T. N. Starodub.

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Translated by E. Bondareva

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Starodub, T.N., Kolosov, M.A., Fenske, D. et al. Crystal and Molecular Structure of Anion Radical Salt (N-Me-DABCO)(TCNQ)2. Crystallogr. Rep. 67, 188–192 (2022). https://doi.org/10.1134/S1063774522020195

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